This is might be a dumb question, but here goes.

Recently I shoot a roll of Ilford HP5 with my Canon F1 and developed the roll with Paterson Aculux 2. When I made prints from some of the negatives the grain structure was much lager in one print than in another. The only difference that I could think of to account for the difference was that the photo with the very apparent grain were shoot at about f/2.8 and the one that had much smaller grain was shot at f/8 or f/16. Does grain really get larger the wider the aperture is open?

I donít remember ever being taught anything about this or reading anything about it and I have never noticed it before. It might be just one of those weird things. Thanks